Work

Floquet topological phases in nonlinear photonic crystals driven in space and time [Invited]

Year: 2025

Type: article

Abstract: We theoretically analyze Floquet topological crystalline phases in temporally and spatially modulated one-dimensional photonic crystals with second-order optical nonlinearity. We identify a space-time symmetry that governs the degeneracy of photonic crystal band structures. By adjusting a system parameter to break or preserve this symmetry, we achieve a Zak phase transition. We also investigate the physical consequences of this transition, focusing on edge states and filling anomalies. These findings suggest a potential approach to realizing topologically protected strong light confinement.

Source: Optical Materials Express

DOI: 10.1364/ome.554624

Authors: Jiaxun Song, Jicheng Jin, Li He, Bo Zhen

Language: English

Topic: Topological Materials and Phenomena

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $1,843

Funders: Office of Naval Research, Army Research Office

Awards: G1414534999, G257222998